*, *:before, *:after {
    box-sizing: border-box;
  }
  
  html {
    font-size: 15px;
    line-height: 1.5;
    font-weight: 300;
    color: #333;
    font-family: "Nunito Sans", sans-serif;
          
  }
  
  body {
    margin: 0;
    padding: 0;
    height: 100vh;
    background-attachment: fixed;
    /* background-image: url("https://s1.ax1x.com/2022/04/11/LEjUYV.jpg"); */
    background-size: cover;
  }

  .body_box
  {
    width: 80%;
    margin: 0 10% 0;
    height: 100%;
    float:left;
    background-color:rgba(0,0,0,0.3)
  }

  .body_head_box
  {
    width:100%;
    /* 激活搜索栏后为11% */
    height:5%;
    max-height: 140px;
    float:left;
    
  }

  .body_head_select_box
  {
    width:100%;
    height:70%;
    max-height: 70px;
    display: flex;
    background: #2D6E7C;
  }
  .body_head_select_order_box
  {
      width:10%;
      min-width: 100px;
      height:100%;
      font-weight: 600;
    /*flex 布局*/
	display: flex;
	/*实现垂直居中*/
	align-items: center;
	/*实现水平居中*/
    justify-content: center;
    margin: 0  0 0 5px;
    border-radius: 5px;

  }
#body_head_select_order_box_1{
    background: #9CDE80;
  }
#body_head_select_order_box_2{
    background: #50BC8F;
  }
  .body_head_select_none_box
  {
      width:70%;
      min-width: 100px;
      height:100%;
      /*flex 布局*/
	display: flex;
	/*实现垂直居中*/
	align-items: center;
	/*实现水平居中*/
    justify-content: center;

  }
  .body_head_select_search_box
  {
      width:10%;
      min-width: 500px;
      height:100%;
    /*flex 布局*/
	display: flex;
	/*实现垂直居中*/
	align-items: center;
	/*实现水平居中*/
    justify-content: center;
  }
  .body_head_select_search_btn
  {
    background: #F9F871
  }

  .body_main_box
  {
    width:100%;
        /* 激活搜索栏后为72% */
    height:75%;
    float:left
    /*flex 布局*/
	/* display: flex; */
	/*实现垂直居中*/
	/* align-items: center; */
	/*实现水平居中*/
    /* justify-content: center; */
  }

  .body_footer_box
  {
    width:100%;
    height:15%;
        /*flex 布局*/
	display: flex;
	/*实现垂直居中*/
	align-items: center;
	/*实现水平居中*/
    justify-content: center;
  }
  
  .heading {
    width: 100%;
    margin-left: 1rem;
    font-weight: 600;
    font-size: 1.618rem;
    text-transform: uppercase;
    letter-spacing: .1ch;
    line-height: 1;
    padding-bottom: .5em;
    margin-bottom: 1rem;
    position: relative;
  }
  .heading:after {
    display: block;
    content: '';
    position: absolute;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #1a9be6, #1a57e6);
    bottom: 0;
  }
  
  .description {
    width: 100%;
    margin-top: 0;
    margin-left: 1rem;
    margin-bottom: 3rem;
  }
  
  .card {
    color: inherit;
    cursor: pointer;
   
    width: calc(70% - 2rem);
    min-width: calc(60% - 2rem);
    height: 200px;
    min-height: 200px;
    perspective: 1000px;

    margin: 1rem;
    margin:1rem 15% 1rem 15%;
    float:left;
  }
  @media screen and (max-width: 800px) {
    .card {
      width: calc(50% - 2rem);
    }
  }
  @media screen and (max-width: 500px) {
    .card {
      width: 100%;
    }
  }
  
  .front,
  .back {
    display: flex;
    border-radius: 6px;
    background-position: center;
    background-size: cover;
    text-align: center;
    justify-content: center;
    align-items: center;
    position: absolute;
    height: 100%;
    width: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    transition: ease-in-out 600ms;
  }
  
  .front {
    background-size: cover;
    padding: 2rem;
    font-size: 1.618rem;
    font-weight: 600;
    color: #fff;
    overflow: hidden;
    font-family: Poppins, sans-serif;
  }
  .front:before {
    position: absolute;
    display: block;
    content: '';
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #1a9be6, #1a57e6);
    opacity: .15;
    z-index: -1;
  }
  .card:hover .front {
    transform: rotateX(180deg);
  }
  .card:nth-child(even):hover .front {
    transform: rotateX(-180deg);
  }
  
  .back {
    background: #fff;
    transform: rotateX(-180deg);
    padding: 0 2em;
  }
  .card:hover .back {
    transform: rotateX(0deg);
  }
  .card:nth-child(even) .back {
    transform: rotateX(180deg);
  }
  .card:nth-child(even):hover .back {
    transform: rotateX(0deg);
  }
  
  .button {
    transform: translateZ(40px);
    cursor: pointer;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    font-weight: bold;
    color: #fff;
    padding: .5em 1em;
    border-radius: 100px;
    font: inherit;
    background: linear-gradient(135deg, #1a9be6, #1a57e6);
    border: none;
    position: relative;
    transform-style: preserve-3d;
    transition: 300ms ease;
  }
  .button:before {
    transition: 300ms ease;
    position: absolute;
    display: block;
    content: '';
    transform: translateZ(-40px);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    height: calc(100% - 20px);
    width: calc(100% - 20px);
    border-radius: 100px;
    left: 10px;
    top: 16px;
    box-shadow: 0 0 10px 10px rgba(26, 87, 230, 0.25);
    background-color: rgba(26, 87, 230, 0.25);
  }
  .button:hover {
    transform: translateZ(55px);
  }
  .button:hover:before {
    transform: translateZ(-55px);
  }
  .button:active {
    transform: translateZ(20px);
  }
  .button:active:before {
    transform: translateZ(-20px);
    top: 12px;
  }
  .step_link_box
  {
    width:50px;
    margin:0 5px 0 0;
    height:50px;
    border-radius:10px;
    font-size:20px;
    font-weight:500;
    text-decoration: none;
    float:left;
    text-align:center;
    /* display:table; */
    color:black;
        /*flex 布局*/
	display: flex;
	/*实现垂直居中*/
	align-items: center;
	/*实现水平居中*/
    justify-content: center;
  }
  #step_link_box_1
  {
    background:#FF6F91
  }
  #step_link_box_2
  {
    background:#FF9671
  }
  #step_link_box_3
  {
    color:red;
    background:#FFC75F
  }
  a{
    color:black;
    font-size:20px;
    text-decoration: none;
  }
  a:hover{
      color:black;
      text-decoration: none;
  }
  @media only screen and (max-width: 800px){ 
    html,body
    {
      height: 200%;
    }
      .body_box
      {
        width: 95%;
        
        margin: 0 2.5% 0;
      }
      .card {
        width:  96%;
        margin: 2%;
      }
      .body_head_box
      {

        height:2%;
        
      }
      }
@media only screen and (max-width: 500px){ 
  html,body
  {
    height: 100%;
  }
    .body_box
    {
      width: 100%;
      height: 100%;
      margin: 0 0% 0;

    }
    .card {
      width:  98%;
      margin: 1%;
    }
    .body_head_box
    {

      height:1%;
      
    }
  }